Add a info.json schema

docs/plugin-info.schema.json

@@ -0,0 +1,61 @@
+{
+    "$schema": "http://json-schema.org/schema",
+    "$id": "https://raw.githubusercontent.com/Chatterino/chatterino2/master/docs/plugin-info.schema.json",
+    "title": "Plugin info",
+    "description": "Describes a Chatterino2 plugin (draft)",
+    "type": "object",
+    "properties": {
+        "name": {
+            "type": "string",
+            "description": "Plugin name shown to the user."
+        },
+        "description": {
+            "type": "string",
+            "description": "Plugin description shown to the user."
+        },
+        "authors": {
+            "type": "string",
+            "description": "A string describing authors of the Plugin. This could be a list of names, an organisation or something else, as long as it's clear who made the Plugin."
+        },
+        "homepage": {
+            "type": "string",
+            "description": "Optional URL to your Plugin's homepage. This could be your GitHub repo for example."
+        },
+        "tags": {
+            "description": "Something that could in the future be used to find your plugin.",
+            "type": "array",
+            "items": {
+                "type": "string",
+                "examples": [
+                    "moderation",
+                    "utility",
+                    "commands"
+                ]
+            },
+            "uniqueItems": true
+        },
+        "version": {
+            "type": "string",
+            "description": "Semver version string, for more info see https://semver.org.",
+            "examples": [
+                "0.0.1",
+                "1.0.0-rc.1"
+            ]
+        },
+        "license": {
+            "type": "string",
+            "description": "A small description of your license.",
+            "examples": [
+                "MIT",
+                "GPL-2.0-or-later"
+            ]
+        }
+    },
+    "required": [
+        "name",
+        "description",
+        "authors",
+        "version",
+        "license"
+    ]
+}

docs/wip-plugins.md

@@ -28,6 +28,7 @@ Example file:
 
 ```json
 {
+  "$schema": "https://raw.githubusercontent.com/Chatterino/chatterino2/master/docs/plugin-info.schema.json",
   "name": "Test plugin",
   "description": "This plugin is for testing stuff.",
   "authors": "Mm2PL",